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IMPLEMENTATION OF A HIGH-EFfiCIENCY, HIGH-LIFETIME, AND LOW-COST CONVERTER FOR AN AUTONOMOUS PHOTOVOLTAIC WATER PUMPING SYSTEM

IMPLEMENTATION OF A HIGH-EFfiCIENCY, HIGH-LIFETIME, AND LOW-COST CONVERTER FOR AN AUTONOMOUS PHOTOVOLTAIC WATER PUMPING SYSTEM

ABSTRACT:

          This project proposes a new converter for photovoltaic (PV) water pumping or treatment systems without the use of chemical storage elements, such as batteries. The converter is designed to drive a three-phase induction motor directly from PV energy. The use of a three-phase induction motor presents a better solution to the commercial dc motor water pumping system.

The development is oriented to achieve a more efficient, reliable,maintenance-free, and cheaper solution than the standard ones that use dc motors or low-voltage synchronous motors. The developed system is based on a current-fed multiresonant converter also known as resonant two-inductor boost converter (TIBC) and a full-bridge three-phase voltage source inverter (VSI). The classic topology of the TIBC has features like high voltage gain and low input current ripple. In this paper, it is further improved with the use of a nonisolated recovery snubber along with a hysteresis controller and the use of a constant duty cycle control to improve its efficiency.

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